Marksheet & Registration Letter

Better to contact  ICAI office Directly over phone or personally. You can get the details if u inform your roll number and PCC registration number to them 

have you changed d address? if so contact it to icai.. may be its being sent to your last addresses

contact ICAI perssonally or by call is the best way

 u can apply for duplicate marksheet and its procedure given in icai.org site